I have both xml and html sitemap on my site,, i just wanted to include subcategory links also in the HTML sitemap.

WhY I am thinking so?

This will help search engine to crawl my inner pages faster
Hyperlinking my subcategory pages in the HTML with keyword relevant to that page will add weight to the page

I am not convinced with my this thought process and confused shall i go ahead with this and will it actually be useful. Need advice.